[Q] Flashing lumia 920 rm821 telstra to rm 820 rogers rom

Hello everyone. i just want to flash my lumia 920 rm821 to rogers rm 820 because i have no static ip option in my lumia and rogers have it for a long time. Is it possible to do so? Because when i try to flash it directly to rogers rom via nokia care suit it gives error message "0xFA001304: Platform ID check fails. Reason(s): The FFU file is not meant for this product. The platform ID of image does not match with platform ID of the device." I am on windows phone 8.1 denim update.

any help.....

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